Day in, day out, on trail runs, mountain scrambles and spring ski tours, the men's Patagonia Traverse Jacket protects, breathes and stays tough for the hard-earned miles. It’s made of a durable recycled polyester/spandex stretch-woven blend that blocks wind and resists moisture while simultaneously allowing your heat to escape. The slim fit crosses over from running jacket to myriad enduro uses, and strategically placed seams enable full mobility with minimal bulk. A welded-in reverse coil center-front zip is supple and low profile, and the extra-coverage cuffs are shaped without elastic to help warm the hands. Other details: articulated sleeves, a slightly dropped rear hem, a low-profile drawcord hem and zippered handwarmer pockets. With a Deluge DWR (durable water repellent) finish, and a reflective logo on the left chest and center-back neck. Fabric is bluesign approved.

Do you know if the "Patagonia Traverse Jacket" would be suitable outer windbreaker soft shell for cycling in temperatures down to -4f (-20c) ?

Assuming the answer to the above question is positive:I have a 46 inch chest and usually wear a large in jackets. I plan to use a merino wool base layer with a thick fleecy on top. Do you think there would be enough room in the XL size?

Whew, for cycling in temperatures that cold I think I'd want a completely windproof/waterproof shell instead of a softshell, or perhaps a vest, but obviously YMMV as everyone is a little different. I usually suffer the effects of wind the most at my extremities (hands, feet, nose) when I'm on the bike. It sounds like you'll have plenty of warm layers, but check out the Alpine Houdini as a possible alternative, especially if you want to be protected if you get caught in a drizzle. As for your second question, the XL is actually intended for a 46-48 inch chest, so you may not have room to layer, especially with your arms stretched forward onto your handlebars; you might take a look at the XXL to leave room for those layers.